Flushing cistern and watercloset suite of the double trap type



Feb. 15, 1966 c. K. STOTT 3,234,565

FLUSHING CISTERN AND WATERCLOSET SUITE OF THE DOUBLE TRAP TYPE Filed March 20, 1965 5 Sheets-Sheet 1 Feb. 15, 1966 c. K. STOTT 3,234,565

FLUSHING CISTERN AND WATERCLOSET SUITE OF THE DOUBLE TRAP TYPE Filed March 20, 1963 3 Sheets-Sheet 2 /NVJA/TDK MQELSS SToTT Feb. 15, 1966 Filed March 20, 1963 c. K. STOTT 3,234,565 FLUSHING GISTERN AND WATERCLOSET SUITE OF THE DOUBLE TRAP TYPE 3 Sheets-Sheet 5 ixw 7 I 21 i //v Vii/7'08? :ZZ 0/0924: 5 5 To T T United States Patent 3,234,565 FLUSHING CISTERN AND WATERCLOSET SUITE OF THE DOUBLE TRAP TYPE Charles K. Stott, Tixall Lodge, Stafford, England, assignor to Armitage Ware Limited, Rugeley, England, a British company Filed Mar. 20, 1963, Ser. No. 266,668 1 Claim. (Cl. 4-15) This invention relates to a flushing. cistern and water closet suite in which the cistern is either adapted to be close coupled to and supported from a platform of the closet at a rearward position above the flushing chamber thereof or the cistern and closet are made as one piece and correspondingly disposed. In the position forum, the cistern is brought into communication with theflushing chamber by a water discharge pipe or conduit which is either under the control of a valve or is the discharge leg of a normal manually operable syphon provided. in the cistern. Such a water closet has two traps incorporated in the basin, and the space between them is in communication with an air extractionpipe surrounded by a tube serving as a depending extension of the discharge pipe through which flush water is discharged from the cistern into the flushing chamber, sothat during the flushing air is extracted from the said space and the resultant low pressure produced therein serves to initiate a syphonic discharge of the basin.

The primary object of the present invention is to permit of a unit, comprising the air extraction pipe mounted inside the tube to be easily assembled to the said water discharge pipe or conduit of the cistern, and to obtain advantages in economya'nd" simplification in manufacture, substantial conservation of'water and the construction of a large non=restricted, non-choking trapway.

According to the present invention the upper end of the tube of the unit is detachably connected to the termination of the water discharge pipe or conduit of the cistern so as to be suspended in the flushing chamber above the traps, the lower part of the air extraction pipe passing into or through an opening in the floor of the flushing chamber and having a sealing device associated therewith.

Preferably, the lower end of the air extraction pipe passes freely into the opening, the seal being provided by a rigid washer threaded loosely over the said pipe and engaging the said floor.

According to a satisfactory form of construction, the tube and pipe unit consists of a plumbing fitting of which the upper end of the tube is screw threaded for engagement with the lower threaded end of the water discharge pipe or conduit. The lower end of the said pipe is formed or provided with spider legs which converge upon and are fastened to the exterior of the air extraction pipe so as to secure it centrally and spacedly within the bore of the tube, the latter having the sealing washer sleeved over it and passing freely through the opening in the floor of the flushing chamber.

The tube and pipe unit is housed wholly within the vertical dimenion of the flushing chamber, thus enabling the unit to be easily assembled to the discharge pipe, no part of the unit entering the cistern and consequently the interior of the discharge pipe or conduit is never obstructed by any part of the unit, thus facilitating the flow of flush water down the discharge pipe and into the tube of the unit.

In order that the invention shall be thoroughly understood and readily carried into effect a satisfactory form of construction of the invention is illustrated, by way of example, in the accompanying drawings wherein:

FIG. 1 is a transverse vertical section illustrating a flushing cistern with its discharge pipe connected to an Patented Feb. 15, 1966 extension pipe and air extraction pipe unit, the cistern being seated upon a platform of a water closet basin of which sufiicient is illustrated for the purpose of describing the invention.

FIG. 2 is a longitudinal vertical section of cistern and basin seen in FIG. 1.

FIG. 3 is a vertical sectional elevation of the invention applied to a water closet suite of which the basin has a concealed bottom outlet.

FIG. 4 is a vertical section illustrating a modified form of connection between the extension pipe and the water discharge pipe.

As will he observed in the drawing, a flushing cistern 3 is supported at its base 4 on a platform 5 provided at a rearward position of a water closet basin indicated at 6. Thebase 4=is secured to the platform 5 by means of screw clamping devices 7; alternatively, the separate parts 3 and 6 may be constructed in one piece. The basin 6 which is conventional, has a flushing inlet 8 in the top of the platform 5, the flushing inlet 8 leading into a flushing chamber 9 which is in communication with the basin 6. The basin 6 is provided in a normal manner with two traps and the space above them, indicated at 10, FIG. 1, is in communication with an air extraction pipe 12. The cistern 3 has a water discharge pipe or conduit 13 which in'this example is the discharge leg 14 of a manually operable syphon 15 assembled in the cistern 3, the discharge pipe 13 projecting through an opening 16 in the base 4 ofthe cistern. Alternatively, the discharge pipe 13 is under the control of a manually operable valve. The air extraction pipe 12 is coaxial with andpartly surrounded by an extension pipe 17 formed with a constriction for increasing the rate of flow of flush water discharged through the pipe 17, into the flushing chamber 9. The air extraction pipe 12 is combined as a unit with the pipe 17 thereby providing a unit handled assembly connected to the lower end of the discharge pipe, the pipe 17 serving as a depending extension of the discharge pipe 13. The upper end of the extension pipe is detachably connected to the termination of the water discharge pipe 13, the connection enabling the pipe 17 to be suspended in the flushing chamber 9, for which purpose the discharge pipe 13 is externally screw threaded for reception of the correspondingly tapped bore of the extension pipe 17. The latter has a conical head or packing ring 19 which seats upon a correspondingly coned seating formed in the flushing inlet 8 and is thereby clamped or secured to the roof of the flushing chamber 9 by the base 4 of the cistern engaging the upper surface of the conical head.- The extension pipe 17 and extraction pipe 12 are thus suspended in the flushing chamber 9 with the lower end of the pipe 12 extending into an opening in the floor 21 of the chamber 9. The unit pipes 12 and 17 provides a simple plumbing fitting which by means of its tapped upper end can be engaged readily with the screwed pipe 13. The lower part of the pipe 17 is formed or provided with spider legs 22 which converge upon and are fastened to the exterior of the air extraction pipe 12 so as to secure it centrally and spacedly within the bore of the pipe 17, the latter having a sealing washer 23 sleeved over it, and passing freely through the opening 20 in the floor 21 of the flushing chamber 9.

The pipe unit 12, 17 is housed wholly within the vertical dimension of the flushing chamber 9, thus enabling the unit to be easily assembled to the discharge pipe, no part of the unit entering the cistern 3 and consequently the interior of the discharge pipe or conduit 13 is never obstructed by any part of the unit 12, 17 thus facilitating the flow of flush water down the discharge pipe 13 into the extension pipe 17 and thence to the flushing chamber 9.

As the flush water passes through the constricted extension pipe 17, the water produces a sufficiently strong. SUCr...

tion eflect at the upper perforated end of the tube 12 whereby air is drawn upwardly through the tube by extracting it from the space 10 above the said traps, theresulting sub-normal pressure produced in the said space serving to initiate a syphonic discharge of the closet basin via the traps.

Referring to FIG. 3 the pipe unit 12, 17 is housed again wholly within the vertical dimension of the flushing chamber 9 of the basin 6 having two traps 10 and 10a of which the latter is in communication with a concealed outlet 24 at the underside of the base 25; a recess 26 surrounds the outlet 24 and receives a rubber or like resilient gasket 27 for making a liquid tight joint with a floor 28, pressure being exerted on the gasket 27 by a mechanically secured plate 29.

In FIG. 4, there is illustrated a preferred form of construction for fitting the extension pipe 17 containing the air extraction pipe 12, to the discharge leg 14 of the syphon 15. For this purpose the discharge leg 14 has fitted to its lower end a bush 30 which is externally screw threaded at 31 and has an external flange 32. The screwed bush 30 is engaged by the upper part of the tapped bore of a cylindrical adaptor 33 having an external flange 34. The lower part of the tapped adaptor 33 is engaged by the externally screw threaded upper end 35 of the extension pipe 17. Leak-proof joints at the interior and the exterior of the base 4 of the cistern 3 are made by means of washers 36 and 37 provided between the 'bush flange 32 and the adaptor flange 34. A conical sealing washer 38 is interposed between the underside of the adaptor flange 34 and the mouth of the flushing inlet 8 so as to provide a leak-proof joint. Compressive stress is imposed on the washer 38 and confines it between the flange 34 and the said mouth upon tightening the screw clamping devices 7 employed for connecting the cistern 3 to the top of the platform 5 as above described.

I claim:

A flushing cistern and water closet suite comprising a cistern anda water closet bas in,.said basin comprisinga pair of water traps and a flushing chamber connected to an air space between the traps by an air extractor unit, the second of said traps being connected to a concealed bottom outlet, said air space being defined 'by a roof, the floor of said flushing chamber constituting said roof, a flushing cistern having an outlet discharge pipe extending through the roof of said chamber, a discharge extension pipe housed substantially wholly in the flushing chamber and connected to said discharge outlet pipe, said discharge extension pipe being in direct contact with and secured to the roof of said chamber and depending into said chamber, said discharge extension pipe having a variable cross-section which is minimum between its ends, said air extractor unit housed substantially wholly in said flushing chamber and forming a unit handled assembly with said discharge extension pipe, said extraction unit comprising a pipe extending through the floor of said chamber towards the roof ,of said chamber and being sealed to said floor by a rigid washer threaded over said pipe, said extraction pipe extending co-axially of the discharge extension pipe and being perforated above the minimum cross-sectional zone of the said discharge extension pipe. 1

References Cited by the Examiner UNITED STATES PATENTS 476,867 6/1892 Boyle 427 1,393,089 10/1921 Collie 285161 1,970,789 8/1934 Zwermann 4--14 2,657,703 11/1953 Beltcher 285161 FOREIGN PATENTS 667,523 3/1952 Great Britain.

LAVERNE D. GEIGER, Primary Examiner.

EDWARD V. BENHAM, LEWIS J. LENNY, I

I Examiners. 

